JNK-1-IN-4 (Compound E1) is an inhibitor for JNK , that inhibits JNK-1, JNK-2 and JNK-3 with IC 50 s of 2.7, 19.0 and 9.0 nM, respectively. JNK-1-IN-4 inhibits the phosphorylation of c-Jun , and reduces the expression of TGF-β1-induced EMT marker proteins, such as fibronectin and α-SMA. JNK-1-IN-4 exhibits good pharmacokinetic characteristics with a bioavailability of 69%. JNK-1-IN-4 exhibits anti-fibrotic effect in Bleomycin -induced mice idiopathic pulmonary fibrosis models.